More optimizations for the single-file merge case.
More optimizations for the single-file merge case.

* subversion/libsvn_client/merge.c
  (remove_noop_merge_ranges): Avoid a linear trampse through the array
    of operative revisions if the entire range fails to overlap with the
    requested merge range.

Suggested by: kfogel

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion